text: /*
   * Copyright (c) 2000-2018 Apple Inc. All rights reserved.
   *
   * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   *
   * This file contains Original Code and/or Modifications of Original Code
   * as defined in and that are subject to the Apple Public Source License
   * Version 2.0 (the 'License'). You may not use this file except in
   * compliance with the License. The rights granted to you under the License
   * may not be used to create, or enable the creation or redistribution of,
   * unlawful or unlicensed copies of an Apple operating system, or to
   * circumvent, violate, or enable the circumvention or violation of, any
   * terms of an Apple operating system software license agreement.
   *
   * Please obtain a copy of the License at
   * http://www.opensource.apple.com/apsl/ and read it before using this file.
   *
   * The Original Code and all software distributed under the License are
   * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   * Please see the License for the specific language governing rights and
   * limitations under the License.
   *
   * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   */
  
  /*
   * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  /*
   * Copyright (c) 1985, 1986, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)in_var.h	8.1 (Berkeley) 6/10/93
   */
  
  #ifndef _NETINET6_IN6_VAR_H_
  #define _NETINET6_IN6_VAR_H_
  #include <sys/appleapiopts.h>
  #include <net/net_kev.h>
  
  #ifdef BSD_KERNEL_PRIVATE
  #include <sys/tree.h>
  #include <sys/mcache.h>
  #endif /* BSD_KERNEL_PRIVATE */
  #include <netinet6/scope6_var.h>
  #include <sys/kern_event.h>
  #include <net/ethernet.h>
  
  /*
   * pltime/vltime are just for future reference (required to implements 2
   * hour rule for hosts).  they should never be modified by nd6_timeout or
   * anywhere else.
   *	userland -> kernel: accept pltime/vltime
   *	kernel -> userland: throw up everything
   *	in kernel: modify preferred/expire only
   */
  struct in6_addrlifetime {
  	time_t ia6t_expire;     /* valid lifetime expiration time */
  	time_t ia6t_preferred;  /* preferred lifetime expiration time */
  	u_int32_t ia6t_vltime;  /* valid lifetime */
  	u_int32_t ia6t_pltime;  /* prefix lifetime */
  };
  
  #ifdef BSD_KERNEL_PRIVATE
  struct in6_addrlifetime_32 {
  	u_int32_t ia6t_expire;
  	u_int32_t ia6t_preferred;
  	u_int32_t ia6t_vltime;
  	u_int32_t ia6t_pltime;
  };
  
  struct in6_addrlifetime_64 {
  	u_int64_t ia6t_expire;
  	u_int64_t ia6t_preferred;
  	u_int32_t ia6t_vltime;
  	u_int32_t ia6t_pltime;
  };
  
  /*
   * Internal representation of ia6_lifetime (expiration in uptime unit)
   */
  struct in6_addrlifetime_i {
  	u_int64_t ia6ti_expire;         /* valid lifetime expiration time */
  	u_int64_t ia6ti_preferred;      /* preferred lifetime expiration time */
  	u_int32_t ia6ti_vltime;         /* valid lifetime */
  	u_int32_t ia6ti_pltime;         /* prefix lifetime */
  	u_int64_t ia6ti_base_calendartime; /* calendar time at creation */
  	u_int64_t ia6ti_base_uptime;    /* uptime at creation */
  };
  
  /*
   * Interface address, IPv6 version.  One of these structures
   * is allocated for each interface with an IPv6 address.
   * The ifaddr structure contains the protocol-independent part
   * of the structure and is assumed to be first.
   */
  
  struct in6_ifaddr {
  	struct ifaddr ia_ifa;           /* protocol-independent info */
  #define ia_ifp          ia_ifa.ifa_ifp
  #define ia_flags        ia_ifa.ifa_flags
  	struct sockaddr_in6 ia_addr;    /* interface address */
  	struct sockaddr_in6 ia_net;     /* network number of interface */
  	struct sockaddr_in6 ia_dstaddr; /* space for destination addr */
  	struct sockaddr_in6 ia_prefixmask; /* prefix mask */
  	u_int32_t ia_plen;              /* prefix length */
  	struct in6_ifaddr *ia_next;     /* next in6 list of IP6 addresses */
  	int ia6_flags;
  
  	struct in6_addrlifetime_i ia6_lifetime;
  	/*
  	 * the creation time of this address, which is
  	 * currently used for temporary addresses only.
  	 */
  	u_int64_t ia6_createtime;
  	u_int64_t ia6_updatetime;
  
  	/* back pointer to the ND prefix */
  	struct nd_prefix *ia6_ndpr;
  
  	/* multicast addresses joined from the kernel */
  	LIST_HEAD(, in6_multi_mship) ia6_memberships;
  };
  
  #define ifatoia6(ifa)   ((struct in6_ifaddr *)(void *)(ifa))
  #endif /* BSD_KERNEL_PRIVATE */
  
  /* control structure to manage address selection policy */
  struct in6_addrpolicy {
  	struct sockaddr_in6 addr; /* prefix address */
  	struct sockaddr_in6 addrmask; /* prefix mask */
  	int preced;             /* precedence */
  	int label;              /* matching label */
  	u_quad_t use;           /* statistics */
  };
  
  /*
   * IPv6 interface statistics, as defined in RFC2465 Ipv6IfStatsEntry (p12).
   */
  struct in6_ifstat {
  	u_quad_t ifs6_in_receive;       /* # of total input datagram */
  	u_quad_t ifs6_in_hdrerr;        /* # of datagrams with invalid hdr */
  	u_quad_t ifs6_in_toobig;        /* # of datagrams exceeded MTU */
  	u_quad_t ifs6_in_noroute;       /* # of datagrams with no route */
  	u_quad_t ifs6_in_addrerr;       /* # of datagrams with invalid dst */
  	u_quad_t ifs6_in_protounknown;  /* # of datagrams with unknown proto */
  	                                /* NOTE: increment on final dst if */
  	u_quad_t ifs6_in_truncated;     /* # of truncated datagrams */
  	u_quad_t ifs6_in_discard;       /* # of discarded datagrams */
  	                                /* NOTE: fragment timeout is not here */
  	u_quad_t ifs6_in_deliver;       /* # of datagrams delivered to ULP */
  	                                /* NOTE: increment on final dst if */
  	u_quad_t ifs6_out_forward;      /* # of datagrams forwarded */
  	                                /* NOTE: increment on outgoing if */
  	u_quad_t ifs6_out_request;      /* # of outgoing datagrams from ULP */
  	                                /* NOTE: does not include forwrads */
  	u_quad_t ifs6_out_discard;      /* # of discarded datagrams */
  	u_quad_t ifs6_out_fragok;       /* # of datagrams fragmented */
  	u_quad_t ifs6_out_fragfail;     /* # of datagrams failed on fragment */
  	u_quad_t ifs6_out_fragcreat;    /* # of fragment datagrams */
  	                                /* NOTE: this is # after fragment */
  	u_quad_t ifs6_reass_reqd;       /* # of incoming fragmented packets */
  	                                /* NOTE: increment on final dst if */
  	u_quad_t ifs6_reass_ok;         /* # of reassembled packets */
  	                                /* NOTE: this is # after reass */
  	                                /* NOTE: increment on final dst if */
  	u_quad_t ifs6_atmfrag_rcvd;     /* # of atomic fragments received */
  	u_quad_t ifs6_reass_fail;       /* # of reass failures */
  	                                /* NOTE: may not be packet count */
  	                                /* NOTE: increment on final dst if */
  	u_quad_t ifs6_in_mcast;         /* # of inbound multicast datagrams */
  	u_quad_t ifs6_out_mcast;        /* # of outbound multicast datagrams */
  
  	u_quad_t ifs6_cantfoward_icmp6; /* # of ICMPv6 packets received for unreachable dest */
  	u_quad_t ifs6_addr_expiry_cnt;  /* # of address expiry events (excluding privacy addresses) */
  	u_quad_t ifs6_pfx_expiry_cnt;   /* # of prefix expiry events */
  	u_quad_t ifs6_defrtr_expiry_cnt;        /* # of default router expiry events */
  };
  
  /*
   * ICMPv6 interface statistics, as defined in RFC2466 Ipv6IfIcmpEntry.
   * XXX: I'm not sure if this file is the right place for this structure...
   */
  struct icmp6_ifstat {
  	/*
  	 * Input statistics
  	 */
  	/* ipv6IfIcmpInMsgs, total # of input messages */
  	u_quad_t ifs6_in_msg;
  	/* ipv6IfIcmpInErrors, # of input error messages */
  	u_quad_t ifs6_in_error;
  	/* ipv6IfIcmpInDestUnreachs, # of input dest unreach errors */
  	u_quad_t ifs6_in_dstunreach;
  	/* ipv6IfIcmpInAdminProhibs, # of input admin. prohibited errs */
  	u_quad_t ifs6_in_adminprohib;
  	/* ipv6IfIcmpInTimeExcds, # of input time exceeded errors */
  	u_quad_t ifs6_in_timeexceed;
  	/* ipv6IfIcmpInParmProblems, # of input parameter problem errors */
  	u_quad_t ifs6_in_paramprob;
  	/* ipv6IfIcmpInPktTooBigs, # of input packet too big errors */
  	u_quad_t ifs6_in_pkttoobig;
  	/* ipv6IfIcmpInEchos, # of input echo requests */
  	u_quad_t ifs6_in_echo;
  	/* ipv6IfIcmpInEchoReplies, # of input echo replies */
  	u_quad_t ifs6_in_echoreply;
  	/* ipv6IfIcmpInRouterSolicits, # of input router solicitations */
  	u_quad_t ifs6_in_routersolicit;
  	/* ipv6IfIcmpInRouterAdvertisements, # of input router advertisements */
  	u_quad_t ifs6_in_routeradvert;
  	/* ipv6IfIcmpInNeighborSolicits, # of input neighbor solicitations */
  	u_quad_t ifs6_in_neighborsolicit;
  	/* ipv6IfIcmpInNeighborAdvertisements, # of input neighbor advs. */
  	u_quad_t ifs6_in_neighboradvert;
  	/* ipv6IfIcmpInRedirects, # of input redirects */
  	u_quad_t ifs6_in_redirect;
  	/* ipv6IfIcmpInGroupMembQueries, # of input MLD queries */
  	u_quad_t ifs6_in_mldquery;
  	/* ipv6IfIcmpInGroupMembResponses, # of input MLD reports */
  	u_quad_t ifs6_in_mldreport;
  	/* ipv6IfIcmpInGroupMembReductions, # of input MLD done */
  	u_quad_t ifs6_in_mlddone;
  
  	/*
  	 * Output statistics. We should solve unresolved routing problem...
  	 */
  	/* ipv6IfIcmpOutMsgs, total # of output messages */
  	u_quad_t ifs6_out_msg;
  	/* ipv6IfIcmpOutErrors, # of output error messages */
  	u_quad_t ifs6_out_error;
  	/* ipv6IfIcmpOutDestUnreachs, # of output dest unreach errors */
  	u_quad_t ifs6_out_dstunreach;
  	/* ipv6IfIcmpOutAdminProhibs, # of output admin. prohibited errs */
  	u_quad_t ifs6_out_adminprohib;
  	/* ipv6IfIcmpOutTimeExcds, # of output time exceeded errors */
  	u_quad_t ifs6_out_timeexceed;
  	/* ipv6IfIcmpOutParmProblems, # of output parameter problem errors */
  	u_quad_t ifs6_out_paramprob;
  	/* ipv6IfIcmpOutPktTooBigs, # of output packet too big errors */
  	u_quad_t ifs6_out_pkttoobig;
  	/* ipv6IfIcmpOutEchos, # of output echo requests */
  	u_quad_t ifs6_out_echo;
  	/* ipv6IfIcmpOutEchoReplies, # of output echo replies */
  	u_quad_t ifs6_out_echoreply;
  	/* ipv6IfIcmpOutRouterSolicits, # of output router solicitations */
  	u_quad_t ifs6_out_routersolicit;
  	/* ipv6IfIcmpOutRouterAdvertisements, # of output router advs. */
  	u_quad_t ifs6_out_routeradvert;
  	/* ipv6IfIcmpOutNeighborSolicits, # of output neighbor solicitations */
  	u_quad_t ifs6_out_neighborsolicit;
  	/* ipv6IfIcmpOutNeighborAdvertisements, # of output neighbor advs. */
  	u_quad_t ifs6_out_neighboradvert;
  	/* ipv6IfIcmpOutRedirects, # of output redirects */
  	u_quad_t ifs6_out_redirect;
  	/* ipv6IfIcmpOutGroupMembQueries, # of output MLD queries */
  	u_quad_t ifs6_out_mldquery;
  	/* ipv6IfIcmpOutGroupMembResponses, # of output MLD reports */
  	u_quad_t ifs6_out_mldreport;
  	/* ipv6IfIcmpOutGroupMembReductions, # of output MLD done */
  	u_quad_t ifs6_out_mlddone;
  };
  
  struct in6_ifreq {
  	char    ifr_name[IFNAMSIZ];
  	union {
  		struct  sockaddr_in6 ifru_addr;
  		struct  sockaddr_in6 ifru_dstaddr;
  		int     ifru_flags;
  		int     ifru_flags6;
  		int     ifru_metric;
  		int     ifru_intval;
  		caddr_t ifru_data;
  		struct in6_addrlifetime ifru_lifetime;
  		struct in6_ifstat ifru_stat;
  		struct icmp6_ifstat ifru_icmp6stat;
  		u_int32_t ifru_scope_id[SCOPE6_ID_MAX];
  	} ifr_ifru;
  };
  
  struct in6_aliasreq {
  	char    ifra_name[IFNAMSIZ];
  	struct  sockaddr_in6 ifra_addr;
  	struct  sockaddr_in6 ifra_dstaddr;
  	struct  sockaddr_in6 ifra_prefixmask;
  	int     ifra_flags;
  	struct in6_addrlifetime ifra_lifetime;
  };
  
  #ifdef PRIVATE
  #define IN6_CGA_MODIFIER_LENGTH 16
  
  struct in6_cga_modifier {
  	u_int8_t octets[IN6_CGA_MODIFIER_LENGTH];
  };
  
  struct in6_cga_prepare {
  	struct in6_cga_modifier cga_modifier;
  	u_int8_t cga_security_level;
  	u_int8_t reserved_A[15];
  };
  
  #define IN6_CGA_KEY_MAXSIZE     2048    /* octets */
  
  struct in6_cga_nodecfg {
  	struct iovec cga_privkey;
  	struct iovec cga_pubkey;
  	struct in6_cga_prepare cga_prepare;
  };
  
  /*
   * XXX in6_llstartreq will be removed once
   * configd adopts the more generically named
   * in6_cgareq structure.
   */
  struct in6_llstartreq {
  	char llsr_name[IFNAMSIZ];
  	int llsr_flags;
  	struct in6_cga_prepare llsr_cgaprep;
  	struct in6_addrlifetime llsr_lifetime;
  };
  
  struct in6_cgareq {
  	char cgar_name[IFNAMSIZ];
  	int cgar_flags;
  	struct in6_cga_prepare cgar_cgaprep;
  	struct in6_addrlifetime cgar_lifetime;
  };
  
  #ifdef BSD_KERNEL_PRIVATE
  /*
   * XXX Corresponding versions of in6_llstartreq
   * will be removed after the new in6_cgareq is
   * adopted by configd
   */
  struct in6_llstartreq_32 {
  	char llsr_name[IFNAMSIZ];
  	int llsr_flags;
  	struct in6_cga_prepare llsr_cgaprep;
  	struct in6_addrlifetime_32 llsr_lifetime;
  };
  
  struct in6_llstartreq_64 {
  	char llsr_name[IFNAMSIZ];
  	int llsr_flags;
  	struct in6_cga_prepare llsr_cgaprep;
  	struct in6_addrlifetime_64 llsr_lifetime;
  };
  
  struct in6_cgareq_32 {
  	char cgar_name[IFNAMSIZ];
  	int cgar_flags;
  	struct in6_cga_prepare cgar_cgaprep;
  	struct in6_addrlifetime_32 cgar_lifetime;
  };
  
  struct in6_cgareq_64 {
  	char cgar_name[IFNAMSIZ];
  	int cgar_flags;
  	struct in6_cga_prepare cgar_cgaprep;
  	struct in6_addrlifetime_64 cgar_lifetime;
  };
  
  #endif /* !BSD_KERNEL_PRIVATE */
  #endif /* PRIVATE */
  
  #ifdef BSD_KERNEL_PRIVATE
  struct in6_aliasreq_32 {
  	char    ifra_name[IFNAMSIZ];
  	struct  sockaddr_in6 ifra_addr;
  	struct  sockaddr_in6 ifra_dstaddr;
  	struct  sockaddr_in6 ifra_prefixmask;
  	int     ifra_flags;
  	struct in6_addrlifetime_32 ifra_lifetime;
  };
  
  struct in6_aliasreq_64 {
  	char    ifra_name[IFNAMSIZ];
  	struct  sockaddr_in6 ifra_addr;
  	struct  sockaddr_in6 ifra_dstaddr;
  	struct  sockaddr_in6 ifra_prefixmask;
  	int     ifra_flags;
  	struct in6_addrlifetime_64 ifra_lifetime;
  };
  #endif /* BSD_KERNEL_PRIVATE */
  
  /* prefix type macro */
  #define IN6_PREFIX_ND   1
  #define IN6_PREFIX_RR   2
  
  /*
   * prefix related flags passed between kernel(NDP related part) and
   * user land command(ifconfig) and daemon(rtadvd).
   */
  struct in6_prflags {
  	struct prf_ra {
  		u_char onlink : 1;
  		u_char autonomous : 1;
  		u_char reserved : 6;
  	} prf_ra;
  	u_char prf_reserved1;
  	u_short prf_reserved2;
  	/* want to put this on 4byte offset */
  	struct prf_rr {
  		u_char decrvalid : 1;
  		u_char decrprefd : 1;
  		u_char reserved : 6;
  	} prf_rr;
  	u_char prf_reserved3;
  	u_short prf_reserved4;
  };
  
  struct  in6_prefixreq {
  	char    ipr_name[IFNAMSIZ];
  	u_char  ipr_origin;
  	u_char  ipr_plen;
  	u_int32_t ipr_vltime;
  	u_int32_t ipr_pltime;
  	struct in6_prflags ipr_flags;
  	struct  sockaddr_in6 ipr_prefix;
  };
  
  #define PR_ORIG_RA      0
  #define PR_ORIG_RR      1
  #define PR_ORIG_STATIC  2
  #define PR_ORIG_KERNEL  3
  
  #define ipr_raf_onlink          ipr_flags.prf_ra.onlink
  #define ipr_raf_auto            ipr_flags.prf_ra.autonomous
  
  #define ipr_statef_onlink       ipr_flags.prf_state.onlink
  
  #define ipr_rrf_decrvalid       ipr_flags.prf_rr.decrvalid
  #define ipr_rrf_decrprefd       ipr_flags.prf_rr.decrprefd
  
  struct in6_rrenumreq {
  	char    irr_name[IFNAMSIZ];
  	u_char  irr_origin;
  	u_char  irr_m_len;      /* match len for matchprefix */
  	u_char  irr_m_minlen;   /* minlen for matching prefix */
  	u_char  irr_m_maxlen;   /* maxlen for matching prefix */
  	u_char  irr_u_uselen;   /* uselen for adding prefix */
  	u_char  irr_u_keeplen;  /* keeplen from matching prefix */
  	struct irr_raflagmask {
  		u_char onlink : 1;
  		u_char autonomous : 1;
  		u_char reserved : 6;
  	} irr_raflagmask;
  	u_int32_t irr_vltime;
  	u_int32_t irr_pltime;
  	struct in6_prflags irr_flags;
  	struct  sockaddr_in6 irr_matchprefix;
  	struct  sockaddr_in6 irr_useprefix;
  };
  
  #define irr_raf_mask_onlink     irr_raflagmask.onlink
  #define irr_raf_mask_auto       irr_raflagmask.autonomous
  #define irr_raf_mask_reserved   irr_raflagmask.reserved
  
  #define irr_raf_onlink          irr_flags.prf_ra.onlink
  #define irr_raf_auto            irr_flags.prf_ra.autonomous
  
  #define irr_statef_onlink       irr_flags.prf_state.onlink
  
  #define irr_rrf                 irr_flags.prf_rr
  #define irr_rrf_decrvalid       irr_flags.prf_rr.decrvalid
  #define irr_rrf_decrprefd       irr_flags.prf_rr.decrprefd
  
  /*
   * Event data, inet6 style.
   */
  struct kev_in6_addrlifetime {
  	u_int32_t ia6t_expire;
  	u_int32_t ia6t_preferred;
  	u_int32_t ia6t_vltime;
  	u_int32_t ia6t_pltime;
  };
  
  struct kev_in6_data {
  	struct net_event_data link_data;
  	struct sockaddr_in6 ia_addr;    /* interface address */
  	struct sockaddr_in6 ia_net;     /* network number of interface */
  	struct sockaddr_in6 ia_dstaddr; /* space for destination addr */
  	struct sockaddr_in6 ia_prefixmask; /* prefix mask */
  	u_int32_t ia_plen;              /* prefix length */
  	u_int32_t ia6_flags;            /* address flags from in6_ifaddr */
  	struct kev_in6_addrlifetime ia_lifetime; /* address life info */
  	uint8_t ia_mac[ETHER_ADDR_LEN];
  };
  
  #ifdef BSD_KERNEL_PRIVATE
  /* Utility function used inside netinet6 kernel code for generating events */
  void in6_post_msg(struct ifnet *, u_int32_t, struct in6_ifaddr *, uint8_t *mac);
  
  #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m)      (       \
  	(((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
  	(((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
  	(((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
  	(((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0)
  
  /*
   * Given a pointer to an in6_ifaddr (ifaddr),
   * return a pointer to the addr as a sockaddr_in6
   */
  #define IA6_IN6(ia)     (&((ia)->ia_addr.sin6_addr))
  #define IA6_DSTIN6(ia)  (&((ia)->ia_dstaddr.sin6_addr))
  #define IA6_MASKIN6(ia) (&((ia)->ia_prefixmask.sin6_addr))
  #define IA6_SIN6(ia)    (&((ia)->ia_addr))
  #define IA6_DSTSIN6(ia) (&((ia)->ia_dstaddr))
  #define IFA_IN6(x)      \
  	(&((struct sockaddr_in6 *)(void *)((x)->ifa_addr))->sin6_addr)
  #define IFA_DSTIN6(x)   \
  	(&((struct sockaddr_in6 *)(void *)((x)->ifa_dstaddr))->sin6_addr)
  #define IFPR_IN6(x)     \
  	(&((struct sockaddr_in6 *)(void *)((x)->ifpr_prefix))->sin6_addr)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCSIFADDR_IN6          _IOW('i', 12, struct in6_ifreq)
  #define SIOCGIFADDR_IN6         _IOWR('i', 33, struct in6_ifreq)
  
  /*
   * SIOCSxxx ioctls should be unused (see comments in in6.c), but
   * we do not shift numbers for binary compatibility.
   */
  #define SIOCSIFDSTADDR_IN6      _IOW('i', 14, struct in6_ifreq)
  #define SIOCSIFNETMASK_IN6      _IOW('i', 22, struct in6_ifreq)
  
  #define SIOCGIFDSTADDR_IN6      _IOWR('i', 34, struct in6_ifreq)
  #define SIOCGIFNETMASK_IN6      _IOWR('i', 37, struct in6_ifreq)
  
  #define SIOCDIFADDR_IN6         _IOW('i', 25, struct in6_ifreq)
  #define SIOCAIFADDR_IN6         _IOW('i', 26, struct in6_aliasreq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCAIFADDR_IN6_32      _IOW('i', 26, struct in6_aliasreq_32)
  #define SIOCAIFADDR_IN6_64      _IOW('i', 26, struct in6_aliasreq_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCSIFPHYADDR_IN6      _IOW('i', 62, struct in6_aliasreq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCSIFPHYADDR_IN6_32   _IOW('i', 62, struct in6_aliasreq_32)
  #define SIOCSIFPHYADDR_IN6_64   _IOW('i', 62, struct in6_aliasreq_64)
  #endif /* BSD_KERNEL_PRIVATE */
  #define SIOCGIFPSRCADDR_IN6     _IOWR('i', 63, struct in6_ifreq)
  #define SIOCGIFPDSTADDR_IN6     _IOWR('i', 64, struct in6_ifreq)
  #define SIOCGIFAFLAG_IN6        _IOWR('i', 73, struct in6_ifreq)
  
  #define SIOCGDRLST_IN6          _IOWR('i', 74, struct in6_drlist)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCGDRLST_IN6_32       _IOWR('i', 74, struct in6_drlist_32)
  #define SIOCGDRLST_IN6_64       _IOWR('i', 74, struct in6_drlist_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCGPRLST_IN6          _IOWR('i', 75, struct in6_prlist)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCGPRLST_IN6_32       _IOWR('i', 75, struct in6_prlist_32)
  #define SIOCGPRLST_IN6_64       _IOWR('i', 75, struct in6_prlist_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define OSIOCGIFINFO_IN6        _IOWR('i', 108, struct in6_ondireq)
  #define SIOCGIFINFO_IN6         _IOWR('i', 76, struct in6_ondireq)
  #define SIOCSNDFLUSH_IN6        _IOWR('i', 77, struct in6_ifreq)
  
  #define SIOCGNBRINFO_IN6        _IOWR('i', 78, struct in6_nbrinfo)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCGNBRINFO_IN6_32     _IOWR('i', 78, struct in6_nbrinfo_32)
  #define SIOCGNBRINFO_IN6_64     _IOWR('i', 78, struct in6_nbrinfo_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCSPFXFLUSH_IN6       _IOWR('i', 79, struct in6_ifreq)
  #define SIOCSRTRFLUSH_IN6       _IOWR('i', 80, struct in6_ifreq)
  
  #define SIOCGIFALIFETIME_IN6    _IOWR('i', 81, struct in6_ifreq)
  #define SIOCSIFALIFETIME_IN6    _IOWR('i', 82, struct in6_ifreq)
  #define SIOCGIFSTAT_IN6         _IOWR('i', 83, struct in6_ifreq)
  #define SIOCGIFSTAT_ICMP6       _IOWR('i', 84, struct in6_ifreq)
  
  #define SIOCSDEFIFACE_IN6       _IOWR('i', 85, struct in6_ndifreq)
  #define SIOCGDEFIFACE_IN6       _IOWR('i', 86, struct in6_ndifreq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCSDEFIFACE_IN6_32    _IOWR('i', 85, struct in6_ndifreq_32)
  #define SIOCSDEFIFACE_IN6_64    _IOWR('i', 85, struct in6_ndifreq_64)
  #define SIOCGDEFIFACE_IN6_32    _IOWR('i', 86, struct in6_ndifreq_32)
  #define SIOCGDEFIFACE_IN6_64    _IOWR('i', 86, struct in6_ndifreq_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCSIFINFO_FLAGS       _IOWR('i', 87, struct in6_ndireq) /* XXX */
  
  /* N.B.: These 3 ioctls are deprecated and won't work */
  #define SIOCSSCOPE6             _IOW('i', 88, struct in6_ifreq)
  #define SIOCGSCOPE6             _IOWR('i', 89, struct in6_ifreq)
  #define SIOCGSCOPE6DEF          _IOWR('i', 90, struct in6_ifreq)
  
  #define SIOCSIFPREFIX_IN6       _IOW('i', 100, struct in6_prefixreq) /* set */
  #define SIOCGIFPREFIX_IN6       _IOWR('i', 101, struct in6_prefixreq) /* get */
  #define SIOCDIFPREFIX_IN6       _IOW('i', 102, struct in6_prefixreq) /* del */
  #define SIOCAIFPREFIX_IN6       _IOW('i', 103, struct in6_rrenumreq) /* add */
  
  /* change */
  #define SIOCCIFPREFIX_IN6       _IOW('i', 104, struct in6_rrenumreq)
  
  /* set global */
  #define SIOCSGIFPREFIX_IN6      _IOW('i', 105, struct in6_rrenumreq)
  
  /*
   * multicast routing, get s/g pkt cnt, pkt cnt per interface.
   */
  #define SIOCGETSGCNT_IN6        _IOWR('u', 28, struct sioc_sg_req6)
  #define SIOCGETMIFCNT_IN6       _IOWR('u', 107, struct sioc_mif_req6)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCGETMIFCNT_IN6_32    _IOWR('u', 107, struct sioc_mif_req6_32)
  #define SIOCGETMIFCNT_IN6_64    _IOWR('u', 107, struct sioc_mif_req6_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  #define SIOCAADDRCTL_POLICY     _IOW('u', 108, struct in6_addrpolicy)
  #define SIOCDADDRCTL_POLICY     _IOW('u', 109, struct in6_addrpolicy)
  
  #ifdef PRIVATE
  /*
   * temporary control calls to attach/detach IPv6 to/from an interface.
   */
  #define SIOCPROTOATTACH_IN6     _IOWR('i', 110, struct in6_aliasreq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCPROTOATTACH_IN6_32  _IOWR('i', 110, struct in6_aliasreq_32)
  #define SIOCPROTOATTACH_IN6_64  _IOWR('i', 110, struct in6_aliasreq_64)
  #endif /* BSD_KERNEL_PRIVATE */
  #define SIOCPROTODETACH_IN6     _IOWR('i', 111, struct in6_ifreq)
  
  /*
   * start/stop aquiring linklocal on interface
   */
  #define SIOCLL_START            _IOWR('i', 130, struct in6_aliasreq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCLL_START_32         _IOWR('i', 130, struct in6_aliasreq_32)
  #define SIOCLL_START_64         _IOWR('i', 130, struct in6_aliasreq_64)
  #endif /* BSD_KERNEL_PRIVATE */
  #define SIOCLL_STOP             _IOWR('i', 131, struct in6_ifreq)
  
  /*
   * accept rtadvd (and stop accepting) on this interface.
   */
  #define SIOCAUTOCONF_START      _IOWR('i', 132, struct in6_ifreq)
  #define SIOCAUTOCONF_STOP       _IOWR('i', 133, struct in6_ifreq)
  
  /*
   * add/remove default IPv6 router.
   */
  #define SIOCDRADD_IN6           _IOWR('u', 134, struct in6_defrouter)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCDRADD_IN6_32        _IOWR('u', 134, struct in6_defrouter_32)
  #define SIOCDRADD_IN6_64        _IOWR('u', 134, struct in6_defrouter_64)
  #endif /* BSD_KERNEL_PRIVATE */
  #define SIOCDRDEL_IN6           _IOWR('u', 135, struct in6_defrouter)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCDRDEL_IN6_32        _IOWR('u', 135, struct in6_defrouter_32)
  #define SIOCDRDEL_IN6_64        _IOWR('u', 135, struct in6_defrouter_64)
  #endif /* BSD_KERNEL_PRIVATE */
  
  /*
   * enable/disable IPv6 router mode on interface.
   */
  #define SIOCSETROUTERMODE_IN6   _IOWR('i', 136, struct in6_ifreq)
  
  /*
   * start secure link-local interface addresses
   */
  #define SIOCLL_CGASTART         _IOW('i', 160, struct in6_cgareq)
  #ifdef BSD_KERNEL_PRIVATE
  #define SIOCLL_CGASTART_32      _IOW('i', 160, struct in6_cgareq_32)
  #define SIOCLL_CGASTART_64      _IOW('i', 160, struct in6_cgareq_64)
  #endif
  
  #define SIOCGIFCGAPREP_IN6      _IOWR('i', 187, struct in6_cgareq)
  #define SIOCSIFCGAPREP_IN6      _IOWR('i', 188, struct in6_cgareq)
  
  #define SIOCCLAT46_START        _IOWR('i', 189, struct in6_ifreq)
  #define SIOCCLAT46_STOP         _IOWR('i', 190, struct in6_ifreq)
  #endif /* PRIVATE */
  
  #ifdef BSD_KERNEL_PRIVATE
  /*
   * XXX: Do not extend IN6_IFF values beyond 16-bit.  We currently copy the
   *	values from ia6_flags as is into m_pkthdr.{src,dst}_iff which are
   *	defined as 16-bit variables.  We can relax this once we define a
   *	unified set of interface flags for {ia,ia6}_flags and perform
   *	translation between those and the publicly-defined ones below.
   */
  #endif /* BSD_KERNEL_PRIVATE */
  #define IN6_IFF_ANYCAST         0x0001  /* anycast address */
  #define IN6_IFF_TENTATIVE       0x0002  /* tentative address */
  #define IN6_IFF_DUPLICATED      0x0004  /* DAD detected duplicate */
  #define IN6_IFF_DETACHED        0x0008  /* may be detached from the link */
  #define IN6_IFF_DEPRECATED      0x0010  /* deprecated address */
  
  /* don't perform DAD on this address (used only at first SIOC* call) */
  #define IN6_IFF_NODAD           0x0020
  
  #define IN6_IFF_AUTOCONF        0x0040  /* autoconfigurable address. */
  #define IN6_IFF_TEMPORARY       0x0080  /* temporary (anonymous) address. */
  #define IN6_IFF_DYNAMIC         0x0100  /* assigned by DHCPv6 service */
  #define IN6_IFF_OPTIMISTIC      0x0200  /* optimistic DAD, i.e. RFC 4429 */
  #define IN6_IFF_SECURED         0x0400  /* cryptographically generated */
  #ifdef PRIVATE
  #define IN6_IFF_SWIFTDAD        0x0800  /* DAD with no delay */
  #endif
  #define IN6_IFF_CLAT46          0x1000  /* Address reserved for CLAT46 */
  #define IN6_IFF_NOPFX           0x8000  /* Depreciated. Don't use. */
  
  /* Duplicate Address Detection [DAD] in progress. */
  #define IN6_IFF_DADPROGRESS     (IN6_IFF_TENTATIVE|IN6_IFF_OPTIMISTIC)
  
  /* do not input/output */
  #define IN6_IFF_NOTREADY        (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED)
  
  /* SLAAC/DHCPv6 address */
  #define IN6_IFF_NOTMANUAL       (IN6_IFF_AUTOCONF|IN6_IFF_DYNAMIC)
  
  #ifdef KERNEL
  #define IN6_ARE_SCOPE_CMP(a, b)         ((a) - (b))
  #define IN6_ARE_SCOPE_EQUAL(a, b)       ((a) == (b))
  #endif /* KERNEL */
  
  #ifdef BSD_KERNEL_PRIVATE
  extern struct in6_ifaddr *in6_ifaddrs;
  
  extern struct icmp6stat icmp6stat;
  extern lck_rw_t in6_ifaddr_rwlock;
  extern lck_mtx_t proxy6_lock;
  extern u_char inet6ctlerrmap[];
  extern u_int32_t in6_maxmtu;
  
  /* N.B.: if_inet6data is never freed once set, so we don't need to lock */
  #define in6_ifstat_add_common(_ifp, _tag, _count, _atomic) do {         \
  	if (_ifp != NULL && IN6_IFEXTRA(_ifp) != NULL) {                \
  	        if (_atomic)                                            \
  	                atomic_add_64(                                  \
  	                    &IN6_IFEXTRA(_ifp)->in6_ifstat._tag, _count);\
  	        else                                                    \
  	                IN6_IFEXTRA(_ifp)->in6_ifstat._tag += _count;   \
  	}                                                               \
  } while (0)
  
  /* atomic version */
  #define in6_ifstat_inc(_ifp, _tag) \
  	in6_ifstat_add_common(_ifp, _tag, 1, TRUE)
  
  /* non-atomic version (for fast paths) */
  #define in6_ifstat_inc_na(_ifp, _tag) \
  	in6_ifstat_add_common(_ifp, _tag, 1, FALSE)
  
  /* atomic add version */
  #define in6_ifstat_add(_ifp, _tag, _count) \
  	in6_ifstat_add_common(_ifp, _tag, _count, TRUE)
  
  /*
   * Macro for finding the internet address structure (in6_ifaddr) corresponding
   * to a given interface (ifnet structure).
   */
  
  #define IFP_TO_IA6(ifp, ia)                                             \
  	/* struct ifnet *ifp; */                                        \
  	/* struct in6_ifaddr *ia; */                                    \
  do {                                                                    \
  	struct ifaddr *_ifa;                                            \
  	ifnet_lock_assert(ifp, LCK_RW_ASSERT_HELD);                     \
  	for (_ifa = (ifp)->if_addrlist.tqh_first; _ifa != NULL;         \
  	    _ifa = _ifa->ifa_list.tqe_next) {                           \
  	        IFA_LOCK(_ifa);                                         \
  	        if (_ifa->ifa_addr->sa_family == AF_INET6) {            \
  	                IFA_ADDREF_LOCKED(_ifa);                        \
  	                IFA_UNLOCK(_ifa);                               \
  	                break;                                          \
  	        }                                                       \
  	        IFA_UNLOCK(_ifa);                                       \
  	}                                                               \
  	(ia) = (struct in6_ifaddr *)_ifa;                               \
  } while (0)
  
  /*
   * IPv6 multicast MLD-layer source entry.
   */
  struct ip6_msource {
  	RB_ENTRY(ip6_msource)   im6s_link;      /* RB tree links */
  	struct in6_addr         im6s_addr;
  	struct im6s_st {
  		uint16_t        ex;             /* # of exclusive members */
  		uint16_t        in;             /* # of inclusive members */
  	}                       im6s_st[2];     /* state at t0, t1 */
  	uint8_t                 im6s_stp;       /* pending query */
  };
  
  RB_HEAD(ip6_msource_tree, ip6_msource);
  
  RB_PROTOTYPE_SC_PREV(__private_extern__, ip6_msource_tree, ip6_msource,
      im6s_link, ip6_msource_cmp);
  
  /*
   * IPv6 multicast PCB-layer source entry.
   *
   * NOTE: overlapping use of struct ip6_msource fields at start.
   */
  struct in6_msource {
  	RB_ENTRY(ip6_msource)   im6s_link;      /* Common field */
  	struct in6_addr         im6s_addr;      /* Common field */
  	uint8_t                 im6sl_st[2];    /* state before/at commit */
  };
  
  /*
   * IPv6 multicast PCB-layer group filter descriptor.
   */
  struct in6_mfilter {
  	struct ip6_msource_tree im6f_sources; /* source list for (S,G) */
  	u_long                  im6f_nsrc;    /* # of source entries */
  	uint8_t                 im6f_st[2];   /* state before/at commit */
  };
  
  /*
   * Legacy KAME IPv6 multicast membership descriptor.
   */
  struct in6_multi_mship {
  	struct  in6_multi *i6mm_maddr;  /* Multicast address pointer */
  	LIST_ENTRY(in6_multi_mship) i6mm_chain;  /* multicast options chain */
  };
  
  #ifdef BSD_KERNEL_PRIVATE
  #include <netinet6/nd6_var.h>
  #include <net/if_llatbl.h>
  
  /*
   * Per-interface IPv6 structures.
   */
  struct in6_ifextra {
  	struct scope6_id        scope6_id;
  	struct in6_ifstat       in6_ifstat;
  	struct icmp6_ifstat     icmp6_ifstat;
  	struct nd_ifinfo        nd_ifinfo;
  	uint32_t                netsig_len;
  	u_int8_t                netsig[IFNET_SIGNATURELEN];
  	struct ipv6_prefix      nat64_prefixes[NAT64_MAX_NUM_PREFIXES];
  	struct lltable          *ii_llt;        /* NDP state */
  };
  #define IN6_IFEXTRA(_ifp)       ((struct in6_ifextra *)(_ifp->if_inet6data))
  #define LLTABLE6(ifp)           ((IN6_IFEXTRA(ifp) == NULL) ? NULL : IN6_IFEXTRA(ifp)->ii_llt)
  #endif /* BSD_KERNEL_PRIVATE */
  
  struct mld_ifinfo;
  
  /*
   * IPv6 group descriptor.
   *
   * For every entry on an ifnet's if_multiaddrs list which represents
   * an IP multicast group, there is one of these structures.
   *
   * If any source filters are present, then a node will exist in the RB-tree
   * to permit fast lookup by source whenever an operation takes place.
   * This permits pre-order traversal when we issue reports.
   * Source filter trees are kept separately from the socket layer to
   * greatly simplify locking.
   *
   * When MLDv2 is active, in6m_timer is the response to group query timer.
   * The state-change timer in6m_sctimer is separate; whenever state changes
   * for the group the state change record is generated and transmitted,
   * and kept if retransmissions are necessary.
   *
   * The request count here is a count of requests for this address, not a
   * count of pointers to this structure.
   *
   * FUTURE: in6m_entry is now only used when groups are being purged
   * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.
   */
  struct in6_multi {
  	decl_lck_mtx_data(, in6m_lock);
  	u_int32_t in6m_refcount;        /* reference count */
  	u_int32_t in6m_reqcnt;          /* request count for this address */
  	u_int32_t in6m_debug;           /* see ifa_debug flags */
  	LIST_ENTRY(in6_multi) in6m_entry; /* list glue */
  	struct  in6_addr in6m_addr;     /* IP6 multicast address */
  	struct  ifnet *in6m_ifp;        /* back pointer to ifnet */
  	struct  ifmultiaddr *in6m_ifma; /* back pointer to ifmultiaddr */
  	u_int   in6m_state;             /* state of the membership */
  	u_int   in6m_timer;             /* MLD6 listener report timer */
  
  	/* New fields for MLDv2 follow. */
  	struct mld_ifinfo       *in6m_mli;      /* MLD info */
  	SLIST_ENTRY(in6_multi)   in6m_dtle;     /* detached waiting for rele  */
  	SLIST_ENTRY(in6_multi)   in6m_nrele;    /* to-be-released by MLD */
  	u_int32_t                in6m_nrelecnt; /* deferred release count */
  	struct ip6_msource_tree  in6m_srcs;     /* tree of sources */
  	u_long                   in6m_nsrc;     /* # of tree entries */
  
  	struct ifqueue           in6m_scq;  /* pending state-change packets */
  	struct timeval           in6m_lastgsrtv;        /* last G-S-R query */
  	uint16_t                 in6m_sctimer;  /* state-change timer */
  	uint16_t                 in6m_scrv;     /* state-change rexmit count */
  
  	/*
  	 * SSM state counters which track state at T0 (the time the last
  	 * state-change report's RV timer went to zero) and T1
  	 * (time of pending report, i.e. now).
  	 * Used for computing MLDv2 state-change reports. Several refcounts
  	 * are maintained here to optimize for common use-cases.
  	 */
  	struct in6m_st {
  		uint16_t        iss_fmode;      /* MLD filter mode */
  		uint16_t        iss_asm;        /* # of ASM listeners */
  		uint16_t        iss_ex;         /* # of exclusive members */
  		uint16_t        iss_in;         /* # of inclusive members */
  		uint16_t        iss_rec;        /* # of recorded sources */
  	}                       in6m_st[2];     /* state at t0, t1 */
  
  	void (*in6m_trace)              /* callback fn for tracing refs */
  	(struct in6_multi *, int);
  };
  
  #define IN6M_LOCK_ASSERT_HELD(_in6m)                                    \
  	LCK_MTX_ASSERT(&(_in6m)->in6m_lock, LCK_MTX_ASSERT_OWNED)
  
  #define IN6M_LOCK_ASSERT_NOTHELD(_in6m)                                 \
  	LCK_MTX_ASSERT(&(_in6m)->in6m_lock, LCK_MTX_ASSERT_NOTOWNED)
  
  #define IN6M_LOCK(_in6m)                                                \
  	lck_mtx_lock(&(_in6m)->in6m_lock)
  
  #define IN6M_LOCK_SPIN(_in6m)                                           \
  	lck_mtx_lock_spin(&(_in6m)->in6m_lock)
  
  #define IN6M_CONVERT_LOCK(_in6m) do {                                   \
  	IN6M_LOCK_ASSERT_HELD(_in6m);                                   \
  	lck_mtx_convert_spin(&(_in6m)->in6m_lock);                      \
  } while (0)
  
  #define IN6M_UNLOCK(_in6m)                                              \
  	lck_mtx_unlock(&(_in6m)->in6m_lock)
  
  #define IN6M_ADDREF(_in6m)                                              \
  	in6m_addref(_in6m, 0)
  
  #define IN6M_ADDREF_LOCKED(_in6m)                                       \
  	in6m_addref(_in6m, 1)
  
  #define IN6M_REMREF(_in6m)                                              \
  	in6m_remref(_in6m, 0)
  
  #define IN6M_REMREF_LOCKED(_in6m)                                       \
  	in6m_remref(_in6m, 1)
  
  /* flags to in6_update_ifa */
  #define IN6_IFAUPDATE_NOWAIT    0x1 /* don't block allocating memory */
  #define IN6_IFAUPDATE_1STADDR   0x2 /* first address on interface */
  #define IN6_IFAUPDATE_NEWADDR   0x4 /* new address on interface */
  #define IN6_IFAUPDATE_DADDELAY  0x8 /* must delay initial DAD probe */
  
  struct ip6_moptions;
  struct sockopt;
  struct inpcb;
  
  extern LIST_HEAD(in6_multihead, in6_multi) in6_multihead;
  
  /*
   * Structure used by macros below to remember position when stepping through
   * all of the in6_multi records.
   */
  struct in6_multistep {
  	struct in6_ifaddr *i_ia;
  	struct in6_multi *i_in6m;
  };
  
  /*
   * Macros for looking up the in6_multi record for a given IP6 multicast
   * address on a given interface. If no matching record is found, "in6m"
   * returns NULL.
   *
   * We do this differently compared other BSD implementations; instead of
   * walking the if_multiaddrs list at the interface and returning the
   * ifma_protospec value of a matching entry, we search the global list
   * of in6_multi records and find it that way.  Otherwise either the two
   * structures (in6_multi, ifmultiaddr) need to be ref counted both ways,
   * which will make things too complicated, or they need to reside in the
   * same protected domain, which they aren't.
   *
   * Must be called with in6_multihead_lock held.
   */
  #define IN6_LOOKUP_MULTI(addr, ifp, in6m)                               \
  	/* struct in6_addr *addr; */                                    \
  	/* struct ifnet *ifp; */                                        \
  	/* struct in6_multi *in6m; */                                   \
  do {                                                                    \
  	struct in6_multistep _step;                                     \
  	IN6_FIRST_MULTI(_step, in6m);                                   \
  	while ((in6m) != NULL) {                                        \
  	        IN6M_LOCK_SPIN(in6m);                                   \
  	        if ((in6m)->in6m_ifp == (ifp) &&                        \
  	            IN6_ARE_ADDR_EQUAL(&(in6m)->in6m_addr, (addr))) {   \
  	                IN6M_ADDREF_LOCKED(in6m);                       \
  	                IN6M_UNLOCK(in6m);                              \
  	                break;                                          \
  	        }                                                       \
  	        IN6M_UNLOCK(in6m);                                      \
  	        IN6_NEXT_MULTI(_step, in6m);                            \
  	}                                                               \
  } while (0)
  
  /*
   * Macro to step through all of the in6_multi records, one at a time.
   * The current position is remembered in "step", which the caller must
   * provide.  IN6_FIRST_MULTI(), below, must be called to initialize "step"
   * and get the first record.  Both macros return a NULL "in6m" when there
   * are no remaining records.
   *
   * Must be called with in6_multihead_lock held.
   */
  #define IN6_NEXT_MULTI(step, in6m)                                      \
  	/* struct in6_multistep step; */                                \
  	/* struct in6_multi *in6m; */                                   \
  do {                                                                    \
  	in6_multihead_lock_assert(LCK_RW_ASSERT_HELD);                  \
  	if (((in6m) = (step).i_in6m) != NULL)                           \
  	        (step).i_in6m = (step).i_in6m->in6m_entry.le_next;      \
  } while (0)
  
  #define IN6_FIRST_MULTI(step, in6m)                                     \
  	/* struct in6_multistep step; */                                \
  	/* struct in6_multi *in6m */                                    \
  do {                                                                    \
  	in6_multihead_lock_assert(LCK_RW_ASSERT_HELD);                  \
  	(step).i_in6m = in6_multihead.lh_first;                         \
  	        IN6_NEXT_MULTI((step), (in6m));                         \
  } while (0)
  
  extern lck_mtx_t *inet6_domain_mutex;
  extern struct domain *inet6domain;
  
  struct ip6_pktopts;
  
  /* Multicast private KPIs. */
  extern int im6o_mc_filter(const struct ip6_moptions *, const struct ifnet *,
      const struct sockaddr_in6 *, const struct sockaddr_in6 *);
  extern int in6_mc_join(struct ifnet *, const struct in6_addr *,
      struct in6_mfilter *, struct in6_multi **, int);
  extern int in6_mc_leave(struct in6_multi *, struct in6_mfilter *);
  extern void in6m_clear_recorded(struct in6_multi *);
  extern void in6m_commit(struct in6_multi *);
  extern void in6m_purge(struct in6_multi *);
  extern void in6m_print(const struct in6_multi *);
  extern int in6m_record_source(struct in6_multi *, const struct in6_addr *);
  extern int ip6_getmoptions(struct inpcb *, struct sockopt *);
  extern int ip6_setmoptions(struct inpcb *, struct sockopt *);
  /* Legacy KAME multicast private KPIs. */
  extern struct in6_multi_mship *in6_joingroup(struct ifnet *,
      struct in6_addr *, int *, int);
  extern int in6_leavegroup(struct in6_multi_mship *);
  extern void in6_multi_init(void);
  extern void in6m_addref(struct in6_multi *, int);
  extern void in6m_remref(struct in6_multi *, int);
  extern int in6_multi_detach(struct in6_multi *);
  extern int in6_ifindex2scopeid(int);
  extern int in6_mask2len(struct in6_addr *, u_char *);
  extern void in6_len2mask(struct in6_addr *, int);
  extern int in6_control(struct socket *, u_long, caddr_t, struct ifnet *,
      struct proc *);
  extern int in6_update_ifa(struct ifnet *, struct in6_aliasreq *, int,
      struct in6_ifaddr **);
  extern void in6_purgeaddr(struct ifaddr *);
  extern int in6if_do_dad(struct ifnet *);
  extern void in6_purgeif(struct ifnet *);
  extern void in6_savemkludge(struct in6_ifaddr *);
  extern void in6_setmaxmtu(void);
  extern void in6_restoremkludge(struct in6_ifaddr *, struct ifnet *);
  extern void in6_purgemkludge(struct ifnet *);
  extern struct in6_ifaddr *in6ifa_ifpforlinklocal(struct ifnet *, int);
  extern struct in6_ifaddr *in6ifa_ifpwithflag(struct ifnet *, int);
  extern struct in6_ifaddr *in6ifa_ifpwithaddr(struct ifnet *, struct in6_addr *);
  extern struct in6_ifaddr *in6ifa_prproxyaddr(struct in6_addr *);
  extern void in6ifa_getlifetime(struct in6_ifaddr *,
      struct in6_addrlifetime *, int);
  extern void in6ifa_setlifetime(struct in6_ifaddr *, struct in6_addrlifetime *);
  extern char *ip6_sprintf(const struct in6_addr *);
  extern int in6_addr2scopeid(struct ifnet *, struct in6_addr *);
  extern int in6_matchlen(struct in6_addr *, struct in6_addr *);
  extern int in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2,
      int len);
  extern void in6_prefixlen2mask(struct in6_addr *maskp, int len);
  extern int in6_prefix_add_ifid(int iilen, struct in6_ifaddr *ia);
  extern void in6_prefix_remove_ifid(int iilen, struct in6_ifaddr *ia);
  extern void in6_purgeprefix(struct ifnet *);
  extern void in6_purgeaddrs(struct ifnet *);
  extern uint8_t im6s_get_mode(const struct in6_multi *,
      const struct ip6_msource *, uint8_t);
  extern void im6f_leave(struct in6_mfilter *);
  extern void im6f_purge(struct in6_mfilter *);
  extern int in6_embedscope(struct in6_addr *, const struct sockaddr_in6 *,
      struct inpcb *, struct ifnet **, struct ip6_pktopts *);
  extern int in6_recoverscope(struct sockaddr_in6 *, const struct in6_addr *,
      struct ifnet *);
  extern void in6_aliasreq_64_to_32(struct in6_aliasreq_64 *,
      struct in6_aliasreq_32 *);
  extern void in6_aliasreq_32_to_64(struct in6_aliasreq_32 *,
      struct in6_aliasreq_64 *);
  extern void in6_ifaddr_init(void);
  extern int in6_inithead(void **, int);
  extern void in6_rtqdrain(void);
  extern struct radix_node *in6_validate(struct radix_node *);
  extern int  in6_if2idlen(struct ifnet *);
  extern int in6_src_ioctl(u_long, caddr_t);
  extern void in6_multihead_lock_exclusive(void);
  extern void in6_multihead_lock_shared(void);
  extern void in6_multihead_lock_assert(int);
  extern void in6_multihead_lock_done(void);
  
  extern void in6_cga_init(void);
  extern void in6_cga_node_lock(void);
  extern void in6_cga_node_unlock(void);
  extern void in6_cga_query(struct in6_cga_nodecfg *);
  extern int in6_cga_start(const struct in6_cga_nodecfg *);
  extern int in6_cga_stop(void);
  extern ssize_t in6_cga_parameters_prepare(void *, size_t,
      const struct in6_addr *, u_int8_t, const struct in6_cga_modifier *);
  extern int in6_cga_generate(struct in6_cga_prepare *, u_int8_t,
      struct in6_addr *);
  extern int in6_getconninfo(struct socket *, sae_connid_t, uint32_t *,
      uint32_t *, int32_t *, user_addr_t, socklen_t *,
      user_addr_t, socklen_t *, uint32_t *, user_addr_t, uint32_t *);
  extern void in6_ip6_to_sockaddr(const struct in6_addr *ip6, u_int16_t port,
      struct sockaddr_in6 *sin6, u_int32_t maxlen);
  
  #endif /* BSD_KERNEL_PRIVATE */
  #endif /* _NETINET6_IN6_VAR_H_ */
  